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<?php // This file is part of Moodle - http://moodle.org/ // // Moodle is free software: you can redistribute it and/or modify // it under the terms of the GNU General Public License as published by // the Free Software Foundation, either version 3 of the License, or // (at your option) any later version. // // Moodle is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // // You should have received a copy of the GNU General Public License // along with Moodle. If not, see <http://www.gnu.org/licenses/>. /** * Exception handler for LTI services * * @package mod_lti * @copyright Copyright (c) 2015 Moodlerooms Inc. (http://www.moodlerooms.com) * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later */ namespace mod_lti; defined('MOODLE_INTERNAL') || die(); require_once(__DIR__.'/../locallib.php'); require_once(__DIR__.'/../servicelib.php'); /** * Handles exceptions when handling incoming LTI messages. * * Ensures that LTI always returns a XML message that can be consumed by the caller. * * @package mod_lti * @copyright Copyright (c) 2015 Moodlerooms Inc. (http://www.moodlerooms.com) * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later */ class service_exception_handler { /** * Enable error response logging. * * @var bool */ protected $log = false; /** * The LTI service message ID, if known. * * @var string */ protected $id = ''; /** * The LTI service message type, if known. * * @var string */ protected $type = 'unknownRequest'; /** * Constructor. * * @param boolean $log Enable error response logging. */ public function __construct($log) { $this->log = $log; } /** * Set the LTI message ID being handled. * * @param string $id */ public function set_message_id($id) { if (!empty($id)) { $this->id = $id; } } /** * Set the LTI message type being handled. * * @param string $type */ public function set_message_type($type) { if (!empty($type)) { $this->type = $type; } } /** * Echo an exception message encapsulated in XML. * * @param \Exception|\Throwable $exception The exception that was thrown */ public function handle($exception) { $message = $exception->getMessage(); // Add the exception backtrace for developers. if (debugging('', DEBUG_DEVELOPER)) { $message .= "\n".format_backtrace(get_exception_info($exception)->backtrace, true); } // Switch to response. $type = str_replace('Request', 'Response', $this->type); // Build the appropriate xml. $response = lti_get_response_xml('failure', $message, $this->id, $type); $xml = $response->asXML(); // Log the request if necessary. if ($this->log) { lti_log_response($xml, $exception); } echo $xml; } }